Facebook built a tool last year to map the spread of diseases. Now it's being used to combat coronavirus. Here's how it works.

Business Insider

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· Facebook has built a tool meant to help track the movements and demographics of people affected by a disease outbreak.
· The tool, called Disease Prevention Maps, was first released in 2019. Now, it's already being used by universities and health nonprofits for COVID-19 prevention.
· The US government is reportedly...

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